Tweaked a comment.

prepare-source

@@ -4,7 +4,7 @@
 # "patches" directory in CVS.
 #
 # NOTE:  if you use a diff from the "patches" directory in a release
-# tar as of 2.6.7, this is not needed (but doesn't hurt anything).
+# tar, this is not needed (but doesn't hurt anything).
 dir=`dirname $0`
 if test x"$dir" = x -o x"$dir" = x.; then
     make -f prepare-source.mak